What does this mean for XML Schema?
The thinking is that XML Schema will "take over" the types xs:anyAtomicType,
xs:yearMonthDuration, and xs:dayTimeDuration - that is, at some time in the
future the normative definition of these types will be in the XML Schema
specifications, not in the XPath data model (XDM). The other two types,
xs:untyped and xs:untypedAtomic, describe data that has not been anywhere
near a schema, so the definitions will remain part of XDM, even though they
have "borrowed" two names in the schema namespace.
In fact the first three types are already in the XML Schema 1.1 working
drafts, and the main factor that caused us to make the change now was to
avoid the much more difficult transition problem that would otherwise occur
in a couple of years' time.
Michael Kay
http://www.saxonica.com/
Cheers,
Bryan Rasmussen
On 2/23/06, Dimitre Novatchev <dnovatchev(_at_)gmail(_dot_)com> wrote:
Wow !!!
---------- Forwarded message ----------
From: Liam Quin <liam(_at_)w3(_dot_)org>
Date: Feb 23, 2006 3:55 PM
Subject: Five xdt:* types renamed
To: www-ql(_at_)w3(_dot_)org
It's relatively unusual to make substantive changes in
specifications
this late in the W3C Process, but everyone involved felt it was an
improvement:
The types xdt:anyAtomicType, xdt:yearMonthDuration,
xdt:dayTimeDuration,
xdt:untyped, and xdt:untypedAtomic will all be moved into the
W3C XML Schema namespace (with the kind permission of the W3C XML
Schema Working Group) and will therefore become xs:anyAtomicType,
xs:yearMonthDuration, xs:dayTimeDuration xs:untyped, and
xs:untypedAtomic.
Liam
(W3C Staff Contact and Participant in the XML Query Working Group)
--
Liam Quin, W3C XML Activity Lead, http://www.w3.org/People/Quin/
Texts and Pictures from old books: http://www.fromoldbooks.org/
Liam ("Ankh") on the Web: http://www.holoweb.net/~liam/
--
Cheers,
Dimitre Novatchev
---------------------------------------
The significant problems we have cannot be solved at the
same level of
thinking with which we created them.
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